{"id":3957,"date":"2015-10-18T07:18:14","date_gmt":"2015-10-18T07:18:14","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=3957"},"modified":"2015-10-27T05:41:55","modified_gmt":"2015-10-27T05:41:55","slug":"gros-plan-sur-la-banquise-dencelade-satellite-de-saturne","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/10\/18\/gros-plan-sur-la-banquise-dencelade-satellite-de-saturne\/","title":{"rendered":"Gros plan sur la banquise d&#8217;Encelade, satellite de Saturne"},"content":{"rendered":"<p><strong>La sonde Cassini vient de survoler le p\u00f4le nord d&#8217;Encelade, ce petit satellite de Saturne recouvert d&#8217;une cro\u00fbte glac\u00e9e qui pourrait cacher un oc\u00e9an.<\/strong><\/p>\n<p>Cassini est une sonde am\u00e9ricaine qui a commenc\u00e9 \u00e0 explorer <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/07\/03\/linclinaison-des-anneaux-de-saturne-de-2004-a-2015\/\" target=\"_blank\">Saturne <\/a>et sa banlieue en 2004. C&#8217;est en janvier 2005 que des images du petit satellite Encelade (500 km de diam\u00e8tre) prises \u00e0 contre-jour r\u00e9v\u00e9l\u00e8rent la pr\u00e9sence de geysers compos\u00e9s de\u00a0vapeur d\u2019eau m\u00eal\u00e9e \u00e0 de la mati\u00e8re organique et sal\u00e9e. 10 ans apr\u00e8s, les plan\u00e9tologues sont arriv\u00e9s \u00e0 la conclusion que <a href=\"http:\/\/www.futura-sciences.com\/magazines\/espace\/infos\/actu\/d\/systeme-solaire-satellite-encelade-abriterait-bien-ocean-global-59894\/\" target=\"_blank\">le satellite Encelade abriterait bien un oc\u00e9an global<\/a>.<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/10\/encelade.jpg\" rel=\"lightbox[3957]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-3958\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/10\/encelade-450x338.jpg\" alt=\"encelade\" width=\"450\" height=\"338\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/10\/encelade-450x338.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/10\/encelade-1024x768.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/10\/encelade.jpg 1200w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>Apr\u00e8s les satellites <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/06\/08\/hyperion-lun-des-satellites-de-saturne-en-gros-plan\/\" target=\"_blank\">Hyp\u00e9rion <\/a>et <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/06\/26\/la-sonde-cassini-survole-dione-un-des-satellites-de-saturne\/\" target=\"_blank\">Dion\u00e9<\/a>, c&#8217;est au tour d&#8217;<a href=\"http:\/\/photojournal.jpl.nasa.gov\/catalog\/PIA19660\" target=\"_blank\">Encelade<\/a>\u00a0de recevoir une nouvelle fois la visite de la sonde Cassini. Passant \u00e0 moins de 6000 km du p\u00f4le nord d&#8217;Encelade, la sonde am\u00e9ricaine nous montre la surface de la banquise (dont l&#8217;\u00e9paisseur est estim\u00e9e entre 30 et 40 km) parsem\u00e9e de crat\u00e8res d&#8217;impact et parcourue de profondes crevasses (la r\u00e9solution de l&#8217;image est de 35 m par pixel).<\/p>\n<p><!--more-->Si cette image est d\u00e9j\u00e0 tr\u00e8s spectaculaire, le meilleur est \u00e0 venir : la <a href=\"https:\/\/www.nasa.gov\/\" target=\"_blank\">NASA <\/a>a pr\u00e9vu de faire passer la sonde Cassini \u00e0 moins de 50 km au-dessus du p\u00f4le sud d&#8217;Encelade le 28 octobre prochain, l&#8217;objectif annonc\u00e9 \u00e9tant de traverser un geyser pour en analyser la composition chimique. On en saura peut-\u00eatre alors un peu plus sur la nature de l&#8217;oc\u00e9an souterrain qui pourrait \u00eatre\u00a0pris en sandwich entre le noyau rocheux du satellite et l\u2019\u00e9paisse banquise de glace survol\u00e9e par Cassini.<\/p>\n<!-- AddThis Advanced Settings generic via filter on the_content --><!-- AddThis Share Buttons generic via filter on the_content -->","protected":false},"excerpt":{"rendered":"<p>La sonde Cassini vient de survoler le p\u00f4le nord d&#8217;Encelade, ce petit satellite de Saturne recouvert d&#8217;une cro\u00fbte glac\u00e9e qui pourrait cacher un oc\u00e9an. Cassini est une sonde am\u00e9ricaine qui a commenc\u00e9 \u00e0 explorer Saturne et sa banlieue en 2004. C&#8217;est en janvier 2005 que des images du petit satellite Encelade (500 km de diam\u00e8tre) &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/10\/18\/gros-plan-sur-la-banquise-dencelade-satellite-de-saturne\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Gros plan sur la banquise d&#8217;Encelade, satellite de Saturne<\/span>  <span class=\"meta-nav\">&rarr;<\/span><\/a><!-- AddThis Advanced Settings generic via filter on get_the_excerpt --><!-- AddThis Share Buttons generic via filter on get_the_excerpt --><\/p>\n","protected":false},"author":8,"featured_media":3958,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[86],"tags":[646,39,486,136,754],"class_list":["post-3957","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-soleil-et-planetes","tag-encelade","tag-geyser","tag-nasa","tag-saturne","tag-sonde-cassini"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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